Sure. I know a few rock climbers. One member of family was even semi-pro for a while. They all build their own walls at home for themselves and their kids.

So I'm certain there's a market for it. If you are involved in the climbing community and have a lot of advice and stories to share, you should also be able to sustain a blog on this topic. Have you looked at what others are doing on this topic online?

Also: How far would you be looking to ship such parts? A national market, or international? Can you custom manufacture at a price that's competitive with what's already on offer?

Oh sorry missed the title - haha, if you are into it and plan to be for a while it's good. There is an audience for everything and I would be pretty sure that one is a pretty large industry.
Damo

What niche are you referring to?